Hash table in C#

In C# hash table is the collection of key or values, which is used to map a key to value. We can use any non-null object as a key; we can retrieve the items from hash table by providing key.

The common function used in hash table is given below:

Add – used to add a pair of value to Hashtable

Syntax

HashTable.Add (Key, Value)

Hashtable h;

h.Add(“1”, “Sachin”);

  

ContainsKey – used to checked a specified key exist or not.

Syntax

bool HashTable.ContainsKey (key)

h.contains(“1”);

ContainsValue - used to checked a specified value exist or not.
Syntax 

bool HashTable.Containsvalue (value)

h.containsvalue(“Sachin”);

Remove – used to delete specified key or values.
Syntax 

HashTable.Remove(key)

h.remove(“1”)

Create a clone of asp controls in asp .net C# on button click

Create a clone of asp controls in asp .net C# on button click

I have faced a real time issue at my website, on button click the page creates duplicate control at my website. After searching, I found  that I have missed closing tag of div, so any html tag if you missed occur duplicate control generation problem.


Solution  : Missed any html closing tag.

What is tuple and how to declare it?

A tuple is s new data type introduced in .Net Framework 4.0. It is used when we want to store multiple values having different data type and without having a class to store the value, in this situation the tuple is best option. In other words a Tuple is a container that contains similar or different data type (7 items) and 1 Tuple.

Declaration of Tuple

The declaration of the Tuple is similar to dictionary <tkey, tvalue>

Tuple<t1>

Tuple<t1, t2, t3>

Tuple<t1, t2, t3, t4>

Tuple<t1, t2, t3, t4, t5>

Tuple<t1, t2, t3, t4, t5, t6>

Tuple<t1, t2, t3, t4, t5, t6, t7>

Tuple<t1, t2, t3, t4, t5, t6, t7, tRest>

T is any data type and tRest a tuple type.

Deconstruction in C# 7.0

 Deconstruction is a process of split a variables value into parts and store it on new variables. It is important when a variable stores multiple values such as tuple.

The method GetATuple returns a tuple with three values.

Example:

(string name, string city, int sal) GetATuple(int id)

{

String name =string.empty;

String city=string.emplty;

Int sal=0;

If (id ==1000)

{

name=”Sachin”;

city=”Kanpur”;

sal=2000;

}

return(name, city, sal)

}